add cur-xx style class

src/assets/style/common4web.less

@@ -199,3 +199,15 @@ textarea {
 .ir-smooth {
 	image-rendering: smooth;
 }
+
+.cur-default {
+	cursor: default;
+}
+
+.cur-pointer {
+	cursor: pointer;
+}
+
+.cur-text {
+	cursor: text;
+}